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I just installed Ubuntu 11.10 i386 32-bit on ma iMac (21", c2d 2.66, 4GB Ram) but I have a problem that I can't solve out: the audio is not working, after a lot of struggles with alsa, i found out that, at the back of the pc, there is the red light coming out from the headphones socket. (macs have the output thing that works as analog if you put an analog jack, and as digital if you put an optical (longer) special jack inside. Ubuntu sends out a digital output instead of sending sound to the iternal speakers. Codec: Realtek ALC889A

Help me!

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open a terminal window and give:

amixer set IEC958 off

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Have you tried clicking the sound icon in the dash, going to sound settings, clicking the hardware tab, selecting the internal audio device and selecting Analog Stereo Output? Also, I have found that sometimes when you change the profile there is no audio (like it's muted) even though everything is set correctly. To fix this, go through all the profiles looking for one that's muted and un-mute it. I have the same audio chipset as you and couldn't get sound on digital out until I went back into Analog Stereo (which had been muted, not by me), un-muted it and changed back to Digital Stereo.

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